文章摘要
郭弘艺,魏凯,唐文乔,李辉华,谢正丽.中国东南沿海日本鳗幼体的发育时相及其迁徙路径分析[J].水产学报,2012,36(12):1793~1801
中国东南沿海日本鳗幼体的发育时相及其迁徙路径分析
Developmental stages and migratory routes of larvae eels from southeast coastal estuaries of China
投稿时间:2012-02-09  修订日期:2012-04-18
DOI:DOI:10.3724/SP.J.1231.2012.27972
中文关键词: 耳石  玻璃鳗  变态  柳叶鳗龄  迁徙路径
英文关键词: otolith  glass eels  metamorphosis  age of leptocephali  migratory routes
基金项目:公益性行业(农业)科研专项经费资助(201203065);上海海洋大学博士启动基金(B-8812-10-0001-0193);上海市科委重点项目(08391910200);上海市教委E-研究院项目(E03009); 上海市重点学科建设项目(S30701)
作者单位E-mail
郭弘艺 上海海洋大学鱼类研究室 hy-guo@shou.edu.cn 
魏凯 上海海洋大学鱼类研究室  
唐文乔 上海海洋大学鱼类研究室 wqtang@shou.edu.cn 
李辉华 上海海洋大学鱼类研究室  
谢正丽 上海海洋大学鱼类研究室  
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中文摘要:
      对2008年1-3月采自中国广东至江苏沿海9个河口的534尾日本鳗幼体鉴定发育时相,分析了其中104尾玻璃鳗的日龄、柳叶鳗龄和抵岸龄。结果显示,中国大陆东南沿海玻璃鳗的柳叶鳗龄为102 (90-112) d,并呈现出地域性的从南至北逐步增大的趋势。Scheffe"s多重比较可将9个群体按柳叶鳗龄的大小归为3个组,南部的新会和汕头归为第1组;中间的福清、宁德、温州、台州归为第2组;北面的慈溪、九段沙和大丰归为第3组。同样,群体的R-聚类和个体的Q-聚类分析也显示出与上述分组相一致的结果。表明从产卵场随北赤道洋流迁徙至菲律宾东北部并进入黑潮接近中国东南沿海的柳叶鳗,分成3个群体迁徙。变态最早的进入了南方的水域,抵达广东沿海;变态较早的进入了中部的东海水域,抵达闽浙沿海;变态最晚的则被送到长江口及其以北的沿海河口。本研究还显示,最北部大丰的柳叶鳗龄(106.00?3.22d)比最南部新会的柳叶鳗龄(91.87?1.36 d)大了14.13 d,其与黑潮流速(约96 km/d)的乘积(1350 Km)与两地的距离大致相等,表明我国沿海的玻璃鳗在柳叶鳗阶段是随着黑潮暖流自南向北被动地迁移的。
英文摘要:
      Abstract: A total of 534 larvae of Anguilla japonica were collected from 9 estuaries in Guangdong, Fujian, Zhenjiang, Shanghai and Jiangsu Province, China, during Jan. -Mar. of 2008.Their pigmentation stages were determined according to the distribution of pigments on the body surface. The age of leptocephali at metamorphosis(Tm), time between metamorphosis to arrival at the estuaries (Tt-m), and age of glass eels (Tt) arriving at the 9 sites were counted according to the number of daily growth increments in the sagitta. The mean Tm was 102 d (90 d to 112 d) and progressively increased from south to north. The homogeneity tests for Tt, Tm and Tt-m among nine estuaries were conducted by Scheffe’s multiple comparison method. According to sampling location and Tm value, leptocephali were divided into three homgeneous groups. Group I was located in two southern sampling sites (Xinhui and Shantou) and had the lowest Tm. In contrast, group III in the 3 northern sampling sites (Jiuduansha, Cixi, Dafeng) had the highest Tm. Group II were in the four mid-sites (Fuqing, Ningde, Wenzhou, Taizhou). Similar result was acquired by R-cluster dendrogram of nine sampling sites and Q-cluster dendrogram of every sample based on Tm. These results indicated that the leptocephalus might migrate in three populations along the North Equatorial Current from their spawning ground to the northeastern continental shelf waters of Philippines, to Kuroshi Current and then to the estuaries of China for metamorphose. The fast-growing leptocephali metamorphosed earlier, and migrated to the southern estuaries and then entered into Guangdong coastal rivers, while the slow-growing ones metamorphosed later and migrated to the Changjiang estuary and the northern estuaries of the range. The remaining leptocephali migrated to the middle coastal waters of East China Sea. The difference of metamorphosis age between south leptocephali (91.87?1.36 d) and north (106.00?3.22 d) was 14.13 d. If the leptocephali were drifted by the Kuroshio Current at a velocity of 96 km day-1, the dispersal distance of the leptocephali for 14.03 d would be 1350 km, approximately equal to the distance between Xinhui and Dafeng. These results suggest that glass eel of Chinese estuaries was passively transported by the Kuroshi Current from the south to north at their leptocephali stage.
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